Cartomizer E-Cigarette

ABSTRACT

An electronic cigarette with a battery unit and a cartomizer unit which includes a cartomizer component which integrates a liquid chamber for receiving a liquid solution and an atomization chamber disposed adjacent to the liquid chamber and separated therefrom by a dividing wall, the dividing wall having a dividing wall opening formed therein, and a guiding wick that extends through the dividing wall opening from the liquid chamber to the atomization chamber to supply liquid solution from the liquid chamber to the atomization chamber.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a Continuation of, and claims the benefit of,U.S. application Ser. No. 13/629,541, filed Sep. 27, 2012, by RobertSafari and titled “Cartomizer E-Cigarette”, which claims the benefit ofU.S. Provisional Application No. 61/541,039 filed Sep. 29, 2011, byRobert Safari and titled “Cartomizer E-Cigarette”, both of which areincluded by reference herein and for which benefit of the priority dateis hereby claimed.

FEDERALLY SPONSORED RESEARCH

Not applicable.

SEQUENCE LISTING OR PROGRAM

Not applicable.

FIELD OF INVENTION

The present invention relates to electronic cigarettes (e-cigarettes)and, in particular, to a cartomizer e-cigarette in which a battery unitis connected to a cartomizer unit which includes a liquid chamber, anatomization chamber and a guiding wick that provides liquid solutionfrom the liquid chamber to the atomization chamber.

BACKGROUND OF THE INVENTION

An electronic cigarette, or e-cigarette, is an electronic device thatsimulates the act of tobacco smoking by producing an inhaled mist oraerosol bearing the physical sensation, appearance, and the flavor andnicotine of inhaled tobacco smoke, without the odor and health risksassociated with tobacco cigarettes. An e-cigarette generally uses heator ultrasonics to vaporize a propylene glycol- or glycerin-based liquidsolution into an aerosol for inhalation.

E-cigarettes are portable, self-contained cylindrical devices the sizeof which depends upon battery capacity. E-cigarettes have been designedto resemble actual cigarettes, cigars or even pipes. Some e-cigarettesare reusable, with replaceable and refillable parts; others aredisposable.

E-cigarettes share three essential components. A “cartridge” serves as amouthpiece and usually doubles as a small reservoir that holds theliquid that is to be vaporized. An atomizer serves as the heatingelement responsible for vaporizing the liquid to provide the aerosolmist. A battery unit serves as a battery supply in portable e-cigarettemodels. Other electronic components necessary for e-cigarette operationare housed within the battery unit.

A “cartomizer” option is available for many e-cigarettes. The cartomizerreplaces the separate cartridge and atomizer components with a singleintegrated component, hence the nomenclature “cartomizer.” Thecartomizer is disposable, as opposed to stand-alone atomizers that arereusable and comparatively expensive.

The cartridge is a small, usually disposable plastic container, withopenings on each end. One end is placed in the user's mouth; the otherend attaches to the atomizer. The cartridge serves as both a liquidreservoir and mouthpiece, and as such, must allow the passage of liquidto the atomizer, as well as aerosol from the atomizer back to the user'smouth without allowing liquid into the mouth. This is usuallyaccomplished using an absorbent sponge-like material placed in thecartridge to keep the liquid in place and which rests on a plasticbarrier separating it from the mouthpiece opening. The mouthpiece casingis constructed with side channels that allow aerosol mist to pass fromthe atomizer, around the liquid reservoir, to the mouthpiece openingand, thus, into the user's mouth. When the liquid in the cartridge hasbeen depleted, the user can usually chose between refilling it orreplacing it with another pre-filled cartridge.

The atomizer is a heating element that is responsible for vaporizing theliquid solution. The atomizer typically includes a simple filament andmetal mesh to draw the liquid solution in from the cartridge. Theatomizer is positioned in the center of the three components. That is,the cartridge attaches to one end of the atomizer and the battery unitattaches to the other end of the atomizer. The atomizer's filament tendsto lose efficiency over time due to a build-up of sediment, or burns outentirely, requiring replacement.

Most portable e-cigarette battery units contain a rechargeablelithium-ion battery. The housing for the battery and the electroniccircuitry required for operation of the e-cigarette is usually thelargest component of the e-cigarette. The battery unit typicallycontains an electronic airflow sensor so that activation of thee-cigarette is triggered by drawing breath through the device. A coloredLED may also be included in the battery unit to announce activation ofthe e-cigarette.

The contents of the liquid solution used to produce aerosol mist ine-cigarettes vary widely, but their common aspects include water andflavorings (e.g., tobacco smoke) in a propylene glycol or glycerin base.Nicotine is also included in solutions intended to fulfill a nicotinereplacement role, without the carcinogenic tar associated with tobaccosmoke.

U.S. Pat. No. 7,832,410, which issued on Nov. 16, 2010, discloses anexample of an electronic atomization cigarette. U.S. Pat. No. 7,832,410is hereby incorporated by reference herein in its entirety to providebackground information regarding the present invention.

SUMMARY OF THE INVENTION

An embodiment of the invention provides a cartomizer unit for use in anelectronic cigarette. The cartomizer unit includes a liquid chamber forreceiving a liquid solution, an atomization chamber disposed adjacent tothe liquid chamber and separated therefrom by a dividing wall, thedividing wall having a dividing wall opening formed therein, and aguiding wick that extends through the dividing wall opening from theliquid chamber to the atomization chamber to supply liquid solution fromthe liquid chamber to the atomization chamber.

The features and advantages of the present invention will be more fullyunderstood and appreciated upon consideration of the following detaileddescription and accompanying drawings, which set forth illustrativeembodiments in which the concepts of the invention are utilized.

BRIEF DESCRIPTION OF THE DRAWINGS

A complete understanding of the present invention may be obtained byreference to the accompanying drawings, when considered in conjunctionwith the subsequent, detailed description, in which:

FIG. 1 is a drawing illustrating an embodiment of a cartomizere-cigarette in accordance with the concepts of the present inventioncomprising a battery unit connected to a cartomizer unit.

FIG. 2 is a drawing illustrating the battery unit shown in FIG. 1

FIG. 3 is an enlarged drawing illustrating the cartomizer componentwhich is part of the cartomizer unit shown in FIG. 1.

FIG. 4 is a drawing illustrating the cartomizer unit shown in FIG. 1.

FIG. 5 is a drawing illustrating the FIG. 1 embodiment in more detail ofa cartomizer e-cigarette wherein the cartomizer unit is connected to thebattery unit to provide a unitary cartomizer e-cigarette device.

DETAILED DESCRIPTION

Before the invention is described in further detail, it is to beunderstood that the invention is not limited to the particularembodiments described, as such may, of course, vary. It is also to beunderstood that the terminology used herein is for the purpose ofdescribing particular embodiments only, and not intended to be limiting,since the scope of the present invention will be limited only by theappended claims.

Where a range of values is provided, it is understood that eachintervening value, to the tenth of the unit of the lower limit unlessthe context clearly dictates otherwise, between the upper and lowerlimit of that range and any other stated or intervening value in thatstated range is encompassed with the invention. The upper and lowerlimits of these smaller ranges may independently be included in thesmaller ranges is also encompassed within the invention, subject to anyspecifically excluded limit in the stated range. Where the stated rangeincludes one or both of the limits, ranges excluding either or both ofthose included limits are also included in the invention.

Unless defined otherwise, all technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe art to which this invention belongs. Although any methods andmaterials similar or equivalent to those described herein can also beused in the practice or testing of the present invention, a limitednumber of the exemplary methods and materials are described herein.

It must be noted that as used herein and in the appended claims, thesingular forms “a”, “an”, and “the” include plural referents unless thecontext clearly dictates otherwise.

All publications mentioned herein are incorporated herein by referenceto disclose and describe the methods and/or materials in connection withwhich the publications are cited. The publications discussed herein areprovided solely for their disclosure prior to the filing date of thepresent application. Nothing herein is to be construed as an admissionthat the present invention is not entitled to antedate such publicationby virtue of prior invention. Further, if dates of publication areprovided, they may be different from the actual publication dates andmay need to be confirmed independently.

FIG. 1 generally shows an embodiment of a cartomizer e-cigarette 100.The cartomizer e-cigarette 100 includes a cartomizer unit 102 and abattery unit 104 that attaches to the cartomizer unit 102, as describedin greater detail below.

Turning now to FIG. 2, the battery unit 104 is shown in detail andseparated from the cartomizer unit 102. The battery unit 104 is disposedwithin a cylindrical battery unit tube 200 to provide a battery unitannular space 204 between an inside wall of the battery unit tube 200and the battery 206. In one embodiment, the cylindrical battery unittube 200 is made from a metal to provide a durable product. In anotherembodiment, the cylindrical battery unit tube 200 is made from a plasticmaterial to provide a more light weight product that more closely mimicsthe experience of a real cigarette. In the illustrated embodiment, thebattery unit 104 has one or more battery unit air intake openings 202formed near the “lighted” end of the e-cigarette 100. The one or morebattery unit air intake openings 202 are in air flow communication withthe battery unit annular space 204. The battery unit 104 includes abattery (e.g., a rechargeable lithium-ion battery) 206 that iselectrically connected to switch controller circuitry 208. Switchcontroller circuitry 208 provides an activation signal to the heatingelement in the cartomizer unit 104 as discussed hereunder. A pressuresensor 210 is connected to the switch controller circuitry 208 and is inair flow communication with the one or more battery unit air intakeopenings 202. The pressure sensor 210 responds to an air pressure changestimulus by causing the switch controller circuitry 208 to provide theactivation signal to the heating element in the cartomizer unit 104.

In the illustrated embodiment, a light emitting diode (LED) 212 iscommunicatively connected to the switch controller circuitry 208. Alight cap 214 fits into an open end of the battery unit tube 200. Thelight cap 214 may be translucent and tinted so that, when the LED 212 isilluminated in response to the activation signal received from theswitch controller circuitry 208, the light cap 214 simulates the burningend of a lit tobacco cigarette. Battery units of the type describedabove are commercially available from Desay Polypower Battery Co., Ltd.located in Guangdong, China.

In the illustrated embodiment, a second threaded male brass fitting 216is disposed at a second end of the battery tube 200. The second fitting216 has an axial second air flow opening 218 formed therein. The secondfitting 216 further includes one or more second fitting air intakeopenings 220 formed therein to provide air flow communication throughthe second fitting 216 to the battery unit annular space 204. The secondfitting 216 is adapted for sealing connection to the first fitting ofthe cartomizer unit 104 such that the axial second fitting air flowopening 218 aligns with the axial first fitting air flow opening of thecartomizer unit 104 to provide air flow communication between thebattery unit annular space 204 and the cartomizer annular space in thecartomizer unit 104, as more fully described below.

Turning now to FIG. 3, the cartomizer component 300 of the cartomizerunit 104 is shown in detail. In the illustrated embodiment, thecartomizer component 300 includes a liquid chamber 310 that contains aliquid solution. In some embodiments, the liquid chamber 310 isrefillable by removing the liquid chamber end cap 315 and introducingnew liquid solution to the liquid chamber 310. In other embodiments, theliquid chamber end cap 315 may be configured with an air intake opening370 covered with a semi-permeable membrane 375 allowing air into theliquid chamber while retaining the liquid solution within the liquidchamber. In other embodiments, the liquid chamber 310 may be sealed. Ineither case, the cartomizer component 300 may be removable and may bereplaced with a new cartomizer component 300 that contains new liquidsolution in the liquid chamber 310. The liquid solution in thereplacement cartomizer component 300 may be the same as or differentthan the liquid solution contained in the previous cartomizer component300. The liquid solution typically is a propylene glycol- orglycerin-based solution of the type well known to those skilled in theart. The liquid solution typically includes a flavoring, e.g., tobacco,and may also include nicotine, as is also well known to those skilled inthe art.

In the illustrated embodiment, the cartomizer component 300 furtherincludes an atomization chamber 320 disposed adjacent to the liquidchamber 310 and separated therefrom by a dividing wall 325 that has adividing wall opening 330 formed therein. A guiding wick 335, e.g., acotton wick, extends through the dividing wall opening 330 from theliquid chamber 310 to the atomization chamber 320 to supply liquidsolution from the liquid chamber 310 to the atomization chamber 320. Inthe illustrated embodiment, an atomization chamber air intake opening340 is formed in an end wall 345 of the atomization chamber 320. In oneembodiment of the invention, the atomization chamber air intake opening340 is an oval shape and disposed diagonally in the end wall 345. Thoseskilled in the art will appreciate that one or more air intake openingsmay be formed in the walls of the atomization chamber 320. Theatomization chamber 320 also has one or more vapor exit openings 365formed therein to provide liquid solution aerosol mist communicationbetween the atomization chamber 320 and the cartomizer unit annularspace, as discussed in greater detail below.

A heating element 350 is disposed within the atomization chamber 320 inproximity to the guiding wick 335. In the illustrated embodiment, theheating element 350 comprises a simple wire coil filament that iswrapped around a cylindrical insulating core. The heating element 350responds to an activation signal by vaporizing the liquid solutionsupplied to the atomization chamber 320 to provide liquid solutionaerosol mist.

Turning now to FIG. 4, the cartomizer component 300 is shown disposed inthe cartomizer unit 102. The generally cylindrical cartomizer component300 is disposed within a cylindrical mouthpiece tube 400. In oneembodiment, the cylindrical mouthpiece tube 400 is made from a metal toprovide a durable product. In another embodiment, the cylindricalmouthpiece tube 400 is made from a plastic material to provide a morelight weight product that more closely mimics the experience of a realcigarette. The cartomizer component 300 is of lesser diameter than themouthpiece tube 400 so as to provide a cartomizer unit annular space 405between the inside wall of the mouthpiece tube 400 and the outside wallof the cartomizer unit 102. In some embodiments, a plurality of spacedapart ribs 305 are formed on the outside wall of the cartomizercomponent 300 to provide stability to the cartomizer component 300within the mouthpiece tube 400 while still permitting air flow in thecartomizer unit annular space 405. The mouthpiece tube 400 has a drawopening 410 formed in it so that a user can apply the inhale portion ofthe user's breath to the cartomizer unit annular space 405. In theillustrated embodiment, a draw end cap 415, e.g., a plastic cap, coversthe draw end of the cylindrical mouthpiece tube 400 except for theaxially located draw opening 410 formed through the cap 415.

The illustrated embodiment also includes a metal mesh pad 420 and aporous vinyl foam pad 425 disposed within the mouthpiece tube 400between the liquid chamber 310 and the draw end of the mouthpiece tube400. Both the metal mesh pad 420 and the vinyl foam pad 425 are circularin shape and of approximately the same diameter as the inner wall of themouthpiece tube 400. The metal mesh pad 420 and the vinyl foam pad 425remove liquid solution droplets that may exist within the aerosol mistpassing from the cartomizer unit annular space 405 to the draw opening410 to prevent the liquid solution droplets from reaching the user'smouth during a user inhale.

As discussed above, the illustrated cartomizer unit 102 is, in keepingwith the cylindrical shape of the e-cigarette 100, a generallycylindrical unitary structure that may be formed in a variety ofphysical formations and may be formed by any suitable technique wellknown to those skilled in the art, including encapsulation techniques.The cartomizer component 300 may be made of any suitable material wellknown to those skilled in the art, such as those used for drug delivery,liquid encapsulated capsules, or other encapsulation materials. Singlewall or multi-wall structures may be used to tailor stability, strengthand rupture resistance of the cartomizer component 300.

In the illustrated embodiment, a first threaded female brass fitting 435is disposed at a second end of the mouthpiece tube 400. The firstfitting 435 has an axial air flow opening 445 formed therein to enableair flow through the first fitting 435 to the cartomizer unit annularspace 405. The first fitting 435 also includes one or more first fittingair intake openings 440 formed at the end of the threaded portion of thefirst fitting 435.

FIG. 5 shows the sealed connection of the cartomizer unit 102 and thebattery unit 104 by the threaded engagement of the male fitting 216 ofthe battery unit 104 with the female fitting 435 of the cartomizer unit102 to provide the unitary structure of the cartomizer e-cigarette 100.FIG. 5 further shows that, when the first and second fittings areconnected, the one or more first fitting air intake openings 440 are inair flow communication with the one or more second fitting air intakeopenings 220 to provide air intake flow to the battery unit annularspace 204.

With reference to FIG. 5, when a user applies an inhale portion of theuser's breath to the mouthpiece end of the cartomizer unit 102, thepressure sensor 210 senses a pressure change in the interior of thee-cigarette 100 and causes the switch controller circuitry 208 toactivate the heating element 350 by applying a current from theelectronically connected battery 206, thereby producing a liquidsolution aerosol mist in the atomization chamber 320. The user's inhalealso causes air intake at the first fitting air intake openings 440,which is passed through the second fitting air intake openings 220,through the axial second air flow opening 218 and axial first air flowopening 445 in the second fitting 216 and first fitting 435,respectively, to combine with the liquid solution aerosol mist formed inthe atomization chamber 320 and pass through cartomizer unit annularspace 405 and the draw end opening 410 into the user's mouth. At thesame time, air flow passes through the battery unit air intake openings202, through the battery unit annular space 204 and the axial second airflow opening 218 and axial first air flow opening 445 in the secondfitting 216 and first fitting 435, respectively, to also combine withthe liquid solution aerosol mist flowing to the user's mouth through thedraw opening 410.

It should be further understood that the examples and embodimentspertaining to the systems and methods disclosed herein are not meant tolimit the possible implementations of the present technology. Further,although the subject matter has been described in a language specific tostructural features and/or methodological acts, it is to be understoodthat the subject matter defined in the appended claims is notnecessarily limited to the specific features or acts described above.Rather, the specific features and acts described above are disclosed asexample forms of implementing the Claims.

Since other modifications and changes varied to fit particular operatingrequirements and environments will be apparent to those skilled in theart, the invention is not considered limited to the example chosen forpurposes of disclosure, and covers all changes and modifications whichdo not constitute departures from the true spirit and scope of thisinvention.

Since other modifications and changes varied to fit particular operatingrequirements and environments will be apparent to those skilled in theart, the invention is not considered limited to the example chosen forpurposes of disclosure, and covers all changes and modifications whichdo not constitute departures from the true spirit and scope of thisinvention.

Since other modifications and changes varied to fit particular operatingrequirements and environments will be apparent to those skilled in theart, the invention is not considered limited to the example chosen forpurposes of disclosure, and covers all changes and modifications whichdo not constitute departures from the true spirit and scope of thisinvention.

What is claimed is:
 1. A cartomizer unit for use in an electroniccigarette, the cartomizer unit comprising: a liquid chamber forreceiving a liquid solution; an atomization chamber disposed adjacent tothe liquid chamber and separated therefrom by a dividing wall, thedividing wall having a dividing wall opening formed therein; at leastone atomization chamber vent formed in the atomization chamber forreceiving air and expelling a liquid solution aerosol mist; and aguiding wick that extends through the dividing wall opening from theliquid chamber to the atomization chamber to supply liquid solution fromthe liquid chamber to the atomization chamber.
 2. The cartomizer unit ofclaim 1, wherein the guiding wick comprises cotton.
 3. The cartomizerunit of claim 1, further comprising: a heating element disposed withinthe atomization chamber in proximity to the guiding wick for vaporizingthe liquid solution supplied to the atomization chamber to provide aliquid solution aerosol mist.
 4. The cartomizer unit of claim 3, furthercomprising an atomization chamber end cap with the heating elementattached thereto such that the heating element is disposed within theatomization chamber and heating element terminals are disposed outsideof the atomization chamber.
 5. The cartomizer unit of claim 1, whereinthe liquid chamber includes a liquid chamber end cap that is removablefor allowing the liquid solution to be received by the liquid chamber.6. The cartomizer unit of claim 5, wherein the liquid chamber end caphas an air intake opening formed therein wherein said air intake openingis covered with a semi-permeable membrane allowing air into said liquidchamber while retaining the liquid solution within the liquid chamber.7. The cartomizer unit of claim 4, wherein the liquid chamber and theatomization chamber are disposed within a cylindrical mouthpiece tubewherein the end of said cylindrical mouthpiece tube adjacent to theliquid chamber is capped with a draw end cap and the end of saidcylindrical mouthpiece tube adjacent to the atomization chamber iscapped with a first fitting.
 8. The cartomizer unit of claim 7, furthercomprising at least one rib attached to the outer wall of theatomization chamber or liquid chamber providing cartomizer unit annularspace between the wall of the cylindrical mouthpiece tube and theatomization chamber and liquid chamber.
 9. The cartomizer unit of claim7, wherein the first fitting comprises an outer threaded fittingsurrounding a cylindrical insulating core surrounding a heating elementcontact surrounding an axial air flow opening.
 10. The cartomizer unitof claim 8, wherein the heating element terminals are connected to theheating element contact.
 11. The cartomizer unit of claim 8, furthercomprising at least one first fitting air intake opening formed therein.12. An electronic cigarette comprising: a cartomizer unit comprising aliquid chamber that contains a liquid solution, an atomization chamberdisposed adjacent to the liquid chamber and separated therefrom by adividing wall, the dividing wall having a dividing wall opening formedtherein, and a guiding wick that extends through the dividing wallopening from the liquid chamber to the atomization chamber to supplyliquid solution from the liquid chamber to the atomization chamber; anda power unit connected to the cartomizer unit.
 13. The electroniccigarette of claim 12, further comprising: a heating element disposedwithin the atomization chamber in proximity to the guiding wick forvaporizing the liquid solution supplied to the atomization chamber toprovide a liquid solution aerosol mist.
 14. The electronic cigarette ofclaim 12, wherein the liquid solution comprises a propylene glycol-basedliquid solution.
 15. The electronic cigarette of claim 12, wherein theliquid solution comprises a glycerin-based liquid solution.
 16. Theelectronic cigarette of claim 12, wherein the liquid solution includesnicotine.
 17. The electronic cigarette of claim 13, wherein the batteryunit includes: a battery; switch controller circuitry connected to thebattery configured to provide an activation signal to the heatingelement that causes the heating element to generate heat that vaporizesthe liquid solution supplied to the atomization chamber to provide theliquid solution aerosol mist; and a pressure sensor communicativelyconnected to the switch controller circuitry wherein the pressure sensorresponds to a stimulus by causing the switch controller circuitry toprovide the activation signal to the heating element.
 18. An electroniccigarette comprising: a mouthpiece tube having a mouthpiece openingformed in a draw end of the mouthpiece tube; a cartomizer unit disposedwithin the mouthpiece tube to provide a cartomizer unit annular spacebetween an inside wall of the mouthpiece tube and the cartomizer unit,the cartomizer unit including (i) a liquid chamber that contains aliquid solution; (ii) an atomization chamber disposed adjacent to theliquid chamber and separated therefrom by a dividing wall, the dividingwall having a dividing wall opening formed therein, the atomizationchamber having one or more atomization chamber air intake openingsformed therein, the atomization chamber further having one or moreaerosol mist exit openings formed therein to provide liquid solutionvapor mist communication between the atomization chamber and thecartomizer unit annular space; and (iii) a guiding wick that extendsthrough the dividing wall opening from the liquid chamber to theatomization chamber to supply liquid solution from the liquid chamber tothe atomization chamber; (iv) a heating element disposed within theatomization chamber in proximity to the guiding wick, the heatingelement responding to an activation signal by vaporizing the liquidsolution supplied to the atomization chamber to provide liquid solutionaerosol mist; a first fitting disposed at a second end of the mouthpiecetube opposite the first end of the mouthpiece tube, the first fittinghaving an axial first fitting air flow opening formed therein to enableair flow through the first fitting to the cartomizer unit annular space;a battery unit tube having one or more battery unit air intake openingsformed therein; a battery unit disposed within the battery unit tube toprovide a battery unit annular space between an inside wall of thebattery unit tube and the battery unit, the battery unit including (i) abattery; (ii) switch controller circuitry connected to the battery andthat provides an activation signal to the heating element to generateheat that causes the heating element to vaporize the liquid solution inthe atomization chamber to provide the liquid solution aerosol mist;(iii) a pressure sensor connected to the switch controller circuitry andin air flow communication with the one or more battery unit air intakeopenings such that the pressure sensor responds to an air pressurechange stimulus by causing the switch controller circuitry to providethe activation signal to the heating element; and a second fittingdisposed at a first end of the battery unit tube, the second fittinghaving an axial second fitting air flow opening formed therein, thesecond fitting being adapted for sealing connection to the first fittingsuch that the axial second fitting air flow opening is aligned with theaxial first fitting air flow opening to provide air flow communicationbetween the battery unit annular space and the cartomizer unit annularspace.
 19. The electronic cigarette of claim 18, wherein the firstfitting further comprises one or more first fitting air intake openingsformed therein, and wherein the second fitting further comprises one ormore second fitting air intake openings formed therein, the secondfitting being adapted for sealing connection to the first fitting suchthat the one or more first fitting air intake openings are in air flowcommunication with the one or more second fitting air intake openings toprovide air intake flow to the battery unit annular space.